-97% is the change from 1000 to 30
Calculation steps:
[( 30 - 1000 ) ÷ 1000] x 100 = -97%
Formula
Percentage change = [(30 - 1000) / 1000] x 100
Subtract the new number by the original number
30 - 1000 = -970
-970 ÷ 1000 = -0.97
-0.97 x 100 = -97%
Example